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← ScienceWhich consequence results when excess oxide anions accumulate at the interface of a solid-oxide fuel cell's electrolyte?
A)Reduced ionic conductivity occurs✓
B)Enhanced electronic conductivity occurs
C)Electrolyte structural integrity heightens
D)Electrode polarization resistance decreases
💡 Explanation
Reduced ionic conductivity occurs because vacancy formation can be poisoned near interfaces, limiting the *Grotthuss mechanism* by which oxide ions migrate across. Therefore, ionic transport decreases rather than electronic increases or maintained crystal integrity, under these charge imbalances.
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